Connective joint with interlocking ring structures, forming a lamp or portions thereof

ABSTRACT

This mechanical joint allows relative rotation of two articles (one may be a stationary fixture), on an arbitrary axis. The joint has as much angular-rotation range as a hinge, but as many degrees of freedom as a ball-and-socket or universal joint. It allows transmission, between the objects, of force or flux (e.g., of electricity, gas, or liquid), or both. It can be used as an applied-force or motion sensor, varying electrical contacts or conductivity in response to relative motion or force applied between the articles. In one form the invention is simply a mechanical joint formed of two closely interlocked toroids. The minor cross-section of each toroid is sized to just fit through the central aperture of the other; there is a connection point on each toroid for attachment of one article. By adjusting closeness of fit, a designer can impart to the device a wide range of desirable frictional properties. In another basic form, the invention has an internal structure of two mutually fixed, interlocked rings or the like. Outer structures, generally ring-shaped, ride on the inner ones. The internal structure may be effectively concealed, but via a common area where they are joined they provide paths for transmitting flux or force between the articles.

This is a divisional of copending application Ser. No. 07/373,997 filedJun. 29, 1989 now U.S. Pat. No. 4,976,468; and of its parent applicationSer. No. 07/059,966 filed on Jun. 9, 1987, and now issued as U.S. Pat.No. 4,845,603.

BACKGROUND

1. Field of the Invention

This invention relates generally to connective mechanical joints; andmore particularly to a joint that permits relative rotation of theinterconnected articles--through large angles, and about an axis havingvirtually any arbitrarily selectable orientation. The joint can beadapted to transmit a force or a flux between the articles.

2. Prior Art

Known connective joints may be considered in three very broadcategories: the hinge, which provides large-amplitude rotation betweentwo hinged elements, but only about a single axis; the ball-and-socketjoint, which provides rotation about arbitrarily selectable axes, butusually with limited range of rotation; and the universal joint, whichis in effect a two-stage hinge.

Both large-amplitude rotation and a wide range of rotational axes areachieved with a universal joint by combining two hinges in series,generally at right angles. The selection of rotational axes isessentially arbitrary if rotation is permitted about one or both pointsof attachment of articles to the universal joint--for example, if thearticles interconnected by the joint are rotatable shafts.

With a ball joint, rotational range is particularly limited when a fluidflux is to be transmitted across the joint--as, for example, in aliquid-transmitting joint such as a shower head.

In two different senses, torque can be transmitted through a hinge oruniversal joint. First, an article attached to one side of the joint canbe rotated by rotating an article attached to the other side of thejoint--provided that the rotation is about an axis on which the hinge oruniversal joint is not free.

(The availability of such an axis for useful purposes depends upon therelative orientation of the two sides of the joint. For example, supposethat the two articles are drive shafts, but the joint is initiallyoperated so that these shafts are mutually at right angles. Now rotationof either shaft about its own axis can be transmitted through the jointto the other, but of course the resulting rotation of the receivingshaft is not about its own axis.)

Force or torque can also be transmitted through a hinge or universaljoint in a second sense. For such transmission, a gear or a tractionsurface is provided on an article at one side of the joint, and asuitably mating drive gear or traction wheel is provided on an articleat the other side of the joint. With this arrangement, forcible rotationof the gear or wheel results in operation of the joint itself--i.e.,change of the relative angle (or angles) at which the two articles arejoined.

In the prior art, it has not been readily feasible to interconnectarticles for rotation through large angles about a virtually arbitraryaxis, using a single-stage joint. Such connection has been particularlyawkward with transmission of force or a flux across the joint.

SUMMARY OF THE DISCLOSURE

By way of introduction, the present invention in its simplest forms maybe very roughly conceptualized as a particularly efficient single-stagehinge, in which there is no separate hinge pin as such. Instead, eachside or element of the hinge can itself serve as the hinge pin, enteringor leaving this role at the pleasure of the user.

Even though this "hinge" has only one stage, its two sides or elementspivot about different axes, thereby permitting operation of the hingeabout virtually any axis the user selects. Consequently thissingle-stage hinge is free to rotate in as many different directions,roughly speaking, as a universal joint. Furthermore, being a hingerather than a ball joint, it operates through a very wide angular range.

Alternatively, and curiously, the invention can be very roughlyconceptualized as a hinge in which everything except the hinge pin hasbeen eliminated--but there are two hinge pins, each rolled or wrappedaround the other in an endless ring, to permit operation of the hinge invirtually any direction.

These informal conceptualizations of my invention may seem contradictoryand slightly baffling, but as will shortly be clear both of them arereasonably accurate. I shall now present some more-rigorous definitionsof the invention.

In one basic form, my invention is a connective joint providing arotational component of relative motion of two articles, about an axishaving any arbitrarily selectable orientation. This form of theinvention includes two interlocking toroids.

In this form of my invention, each of the toroids has a substantiallycircular minor cross-section and a substantially circular centralaperture. The minor cross-section of each toroid is sized tosubstantially just fit through the central aperture of the other toroid.

This first basic form of my invention also has, on each toroid, somemeans for securing that toroid to a respective one of the two articles.For purposes of generality of description, I shall call these means the"connection means."

The preceding three paragraphs may constitute a description of myinvention in its broadest or most general form. There are, however,certain additional features or characteristics which I prefer toincorporate in articles made according to my invention, for mostcomplete development and enjoyment of its inherent advantages.

For example, I consider it preferable to make the sizing tight enough toprovide significant frictional resistance to relative motion of the twoarticles. I also prefer to locate the connection means on each toroid ata point substantially along the outer major periphery of that toroid.

As a matter of personal preference I consider the appearance of thejoint particularly pleasing if the minor cross-sections of the twotoroids are made substantially equal to one another in diameter. Forsome applications, as will be appreciated by those skilled in the art,this condition will also be preferable for mechanical strength or otherpractical properties.

On the other hand, for the sake of variety in some applications thejoint may be made with the minor cross-sections of the two toroidsdifferent. For some applications such a construction may also bepreferable in practical terms.

It will be understood that either of such articles may be asubstantially stationary fixture--such as a wall, an article offurniture, or an appliance pedestal (such as, for example, a lamp base).In that event, the connection means on one of the toroids are secured tothe stationary article.

On the other hand, one or both of the articles may be embedded within orfixed as a thin sheathing or jacketing upon one or both of the toroidsrespectively. In such cases the connection means are of course adaptedfor connection of such articles; they may not necessarily appear asdiscrete features in or on the toroids.

I shall now describe another basic form of my invention. It is aconnective joint providing a rotational component of relative motion oftwo articles, about an axis having an arbitrarily selectableorientation.

This form of my invention includes two interlocking toroids, each havinga substantially circular minor cross-section and a substantiallycircular central aperture. The minor cross-section of each toroid issmall enough to fit through the central aperture of the othertoroid--but in this form of my invention it is not required that theyfit closely.

Instead this form of my invention includes some means for securing thetwo toroids together, for mutual arcuate motion.

Finally this form of the invention includes, on each toroid, connectionmeans for securing that toroid to one of the two articles respectively.

This second basic form of my invention may be described in its mostgeneral terms by the foregoing paragraphs. Once more, however, I preferto incorporate various features or characteristics to optimizeeffectiveness and enjoyment of the invention.

In particular, I prefer to provide the mutual-securing means in the formof an annular track or groove defined along the inner periphery of thecentral aperture in a particular one of the two toroids, and an innerring movably disposed within this groove.

These preferred elements of the securing means may be described in amore general way as: an arcuate guide member, and a correspondingfollower member, adapted and disposed to ride along the correspondingguide to define an arcuate motion of the follower relative to the guide.Various forms of guide and follower member may be provided other than anannular track or groove and an inner ring.

In particular, it is not necessary to use a complete ring or completetrack. A partial ring or partial track, or both a partial ring and apartial track, may be provided within the scope of this form of myinvention.

Only enough mutually constraining structure is required to provide thedesired mutually arcuate motion. For example, it will be clear toskilled mechanical artisans that a great variety of three-point-contactguide-and-follower sets--merely to state one of myriad possibleexamples--may be substituted beneficially for a complete ring and track.

Furthermore, it is not necessary that the toroid actually ride on theinner guide structure, in the sense suggested by the simplified track(or groove) and ring conceptualization. That is, it is not necessarythat the outer structure have an inner track (such as a groove) thatrides on an inner ring. Rather, the track (or groove) may be associatedwith the inner structure, while the ring equivalent may be associatedwith the toroid.

This second form of my invention can further be used in transmitting aforce or flux between the two toroids. As will be seen, forces or fluidor electrical fluxes, or combinations of two or more such fluxes orforces, can be transmitted between the two toroids while preserving therelative mobility and--if desired--the independent appearance of thetoroids.

To realize this potentiality, I also prefer to include some means fortransmitting a force or a flux along a generally circular path withinthe particular toroid having the inner elements just discussed. I shallcall these means the "intratoroid transmitting means", since theytransmit force or flux within the particular one toroid.

These means preferably make use of the inner-peripheraltrack-and-groove--or, more generally, the guide-and-follower set, justdiscussed. The generally circular path is associated with these innerelements. In other words, the same inner elements are advantageouslyused both to provide relative mechanical suspension of the two toroids,and to transmit force or flux along a path within at least one of thetoroids.

As will become clear, two separate sets of inner elements within thetoroid can be provided for these two functions respectively. I prefer touse one set within the toroid for both functions.

this form of my invention also includes some means for transmitting theforce or flux from the above-described path to the other toroid. Againfor generality I shall call these the intertoroid transmission means, asthey transmit force or flux between two toroids.

I show and describe several such preferred features, as well as certainvariants or versions of this second basic form of my invention, in thedetailed-description section of this document. First, however, I wish tointroduce yet another basic form of my invention.

This third form of the invention is a connective joint providing arotational component of relative motion of two articles.

It includes a pair of interlocked inner rings. The two rings are fixedtogether at a common area along the inner peripheries of both rings.

This form of the invention also includes two interlocked outerstructures. Each of these outer structures has a very generally archedbody surrounding a very generally central aperture.

Each of the outer structures also has a peripheral track about itscentral aperture. Each outer structure is movably mounted by this trackto ride on a respective one of the rings. In other words, the rings andtracks are mutually engaged, so that each outer structure is movablymounted to the corresponding ring.

This configuration constrains the interlocked outer structures tomutually arcuate compound trajectories. That is, the inner ringsconstrain the two outer structures to move along arc-shaped pathsrelative to one another.

If desired, one or each of the tracks may take the form of a groovearound the periphery of the central aperture of the corresponding outerstructure. In this version of this form of the invention, the ringsimply fits in the groove, so that the outer structure rides on thering.

More elaborately formed or engaged tracks and rings may be provided, aswill be further detailed shortly. Bearings may be interposed if desiredfor smoother operation.

In describing the mutually arcuate trajectories of the outer structures,I have included the term "compound" for a very important reason. Thepossible trajectory or path for each of the outer structures is notlimited to only one arcuate motion such as a simple rotation orrevolution about the other outer structure.

Rather the motion of each outer structure may include, in effect, travelor displacement along the contour of the other outer structure. Rotationor revolution may be alternated, or may even be concurrent, with suchtravel or displacement.

Therefore very elaborate mutually arcuate compound trajectories arepossible. This is so even though, as already mentioned, the inner ringsare solidly joined.

The body of each outer structure is small enough to fit through thecentral aperture of the other outer structure--in at least part of theirtrajectories. It need not fit through the central aperture of the otherouter structure in all of their trajectories.

Details of the outer structures may be selected essentially arbitrarily,either for practical reasons or for esthetic reasons such asimplementing a particular theme. Accordingly it may be very desirable tomake some parts of one or each outer structure too large to fit throughthe central aperture of the other structure.

For example, one of the outer structures might be configured torepresent the body of an animal, passing through the central aperture ofthe other structure. The head or perhaps certain limbs of the animalfigure might extend laterally too far to pass through that aperture.

This third form of my invention also includes connection means on eachouter structure. The connection means on each outer structure areprovided for securing that particular structure to one of the twoarticles respectively.

Like the previously discussed second form of my invention, the thirdform is also capable of use for transmitting a force or a flux betweenthe articles. To develop this capability, I prefer to include in thisthird form of my invention some means for transmitting force or fluxalong paths within the outer structures.

These paths are generally circular, and each is associated with onerespective inner ring. For generality as before I call these means"intrastructure transmitting means."

In addition this form of my invention includes some means fortransmitting the force or flux from the path associated with one ring tothe path associated with the other ring. I call these means"interstructure transmitting means"; they are defined adjacent to orthrough the common area at which the rings are joined.

To aid in comprehension initially, the foregoing description of thethird form of my invention has been stated with somewhat specificreference to inner "rings" that are fixed to one another, and "tracks"that ride on the rings. Like the second form of my invention, however,this third form is actually much broader than might be supposed fromthis description.

In particular partial rings or partial tracks, or both, may be provided.Only enough mutually constraining structure is required to provide thedesired mutually arcuate compound trajectories, various types ofguide-and-follower sets being substitutable for complete rings andtracks. Furthermore, as with the second form of my invention, it is notnecessary that the outer structures actually ride on the inner guidestructures.

For these reasons a more general description of the third form of myinvention will now be presented. This form of the invention is aconnective joint that provides a rotational component of relative motionof two articles.

It includes a pair of guide-and-follower sets. Each set includes anarcuate guide member and a corresponding follower member. The followermember is adapted and disposed to ride along the corresponding guide todefine an arcuate motion of the follower relative to the guide.

One particular member of each set has an inner periphery. The twoparticular members of each set are fixed together at a common area alongthe inner peripheries of both particular members. By virtue of thisconfiguration the remaining two members are constrained to mutuallyarcuate compound trajectories.

This form of the invention also includes two interlocked outerstructures, each having a very generally arched body surrounding a verygenerally central aperture. Each of the two outer structures is fixed toone of the "remaining two members" just mentioned. Due to thisconfiguration, the interlocked outer structures are likewise constrainedto mutually arcuate compound trajectories.

The body of each outer structure is small enough to fit through thecentral aperture of the other--in at least part of the trajectories ofthe outer structures.

The invention, in the form now under consideration, also has connectionmeans on each outer structure for securing that structure to one of thetwo articles respectively.

The foregoing description of the third form of my invention, presentednow more generally, is able to function as a connective joint. Itsmechanical function as a joint is in effect essentially the same as thatof the first-mentioned form of my invention, consisting of closelyinterlocked toroids.

This form of the invention is also useful for transmitting a force or aflux between the outer structures, and even between the respectivelyattached articles. When so used, this form of the invention includessome means for transmitting force or flux along two generally circularpaths within the outer structures respectively.

I shall call these means the "intrastructure transmitting means". Eachof the two paths is associated with one respective guide-and-followerset.

This form of my invention further includes some means for transmittingforce or flux from the path associated with one guide-and-follower setto the path associated with the other set. These means, which will becalled "interstructure transmitting means", are defined adjacent to orthrough the common area at which the previously mentioned "twoparticular members" are joined together.

This third form thus has the added capability of force or fluxtransmission between the outer structures. In some cases suchtransmission can be provided between the two attached articles securedat the respective connection means.

If desired, the parts of the invention can be formed to nearly concealthe existence of the inner guide-and-follower sets, so that thetransmission capability of the assembled invention appears veryextraordinary. A casual observer will not perceive how a device havingso many degree of freedom could, for example, conduct fluids orelectricity in a circuit.

All of the foregoing operational principles and advantages of thepresent invention will be more fully appreciated upon consideration ofthe following detailed description, with reference to the appendeddrawings, of which:

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a preferred embodiment of my invention.It represents in particular the previously mentioned first basic form ofmy invention. The other basic forms may also have exactly this sameexternal appearance, though it is also possible for them to varyextremely from this configuration.

FIG. 1a are front, rear and side elevations or orthographic projectionsof the FIG. 1 embodiment, on a reduced scale.

FIG. 2 is a front elevation, partly in section, of the same preferredembodiment, particularly showing the relationship between dimensions.

FIG. 3 is a front elevation, on a reduced scale, of a related embodimenthaving a different relationship between dimensions.

FIG. 4 is a front elevation of the embodiment of FIGS. 1 through 2,illustrating the range of possible angular positions of one toroid aboutthe other, while the location of that one toroid along the other is heldfixed.

FIG. 5 is a perspective view of the same embodiment--but particularlyshowing the connection means of one toroid secured to a fixture such asa wall or pedestal, so that any article secured to the other connectionmeans is movably secured with respect to the environment.

FIG. 6 is a similar perspective view particularly showing lock screwsfor fixing the joint in a particular orientation.

FIG. 7 is a similar view, on a reduced scale, particularly showing theinvention in use for adjustable mechanical support of equipment such asa camera.

FIGS. 8 through 26 represent preferred embodiments of the previouslymentioned second and third basic forms of my invention.

FIG. 8 is a perspective view, very generally similar to FIG. 1, of apreferred embodiment of these forms of my invention as adapted forbidirectional conduction of electricity completely across thejoint--that is, between articles secured to the connection means of thetwo outer structures respectively.

In FIG. 8 the outer structures (here, for the sake of simplicity, alsotoroids) are drawn as if transparent. FIG. 8 thus clearly shows both theinner and outer structures in their interrelationship, and indicates ina somewhat schematic way the function of the inner structures (herecomplete rings) for electrical conduction.

FIG. 9 is an elevation, partially in section, of the sameembodiment--with the inner structures in detail.

FIG. 10 is a perspective view of the same embodiment, particularlyshowing the track (here a groove) of one of the outer structures.

FIG. 11 is a perspective view of the joined inner rings alone.

FIGS. 11a through 11c are front, rear and side elevations ororthographic projections of the FIG. 11 rings.

FIG. 12 a perspective view, partially cut away, of the embodiment ofFIGS. 8 through 11c, particularly showing the arrangement for conductionof electricity to and from the joint.

FIG. 13 is a perspective view, on an enlarged scale, of the sameembodiment--also particularly showing how electricity may be conductedto and from one side of the joint.

FIG. 14 is a perspective view of a table lamp, incorporating the jointof FIGS. 8 through 13.

FIG. 15 is a like view of a track-lighting fixture incorporating thesame embodiment.

FIG. 16 is a perspective view, partially cut away, of a preferredembodiment of the second and third forms of my invention as particularlyadapted for conduction of fluid completely across the joint--that is,between articles secured to the connection means of the two outerstructures respectively.

FIG. 16a is a cross-sectional view of one of the toroids of the FIG. 16embodiment, showing its division into the inner and outer structures.

FIG. 17 is a somewhat schematic elevation of the same embodiment withsomewhat thicker walls, and particularly delineating the conduction offluid entirely across the joint.

FIG. 18 is an elevation, partly in section, of the same embodiment witha wall configuration particularly suited to minimize leakage from thejoint.

FIG. 19 is a perspective view of a shower head incorporating theembodiment of FIGS. 16 through 17 or 18.

FIG. 20 is a perspective view, partially cut away, of a preferredembodiment of the second and third basic forms of my invention asadapted for transmission of force to the joint at both sides--that is,between an article secured to the connection means of each outerstructure and the corresponding inner structure.

FIG. 21 is a similar view of a preferred embodiment of any of the threeforms of my invention as adapted for minimization of friction in thejoint.

FIG. 22 is a somewhat schematic or conceptual diagram of a differentguide-and-follower set for use in some embodiments of the second orthird basic form of my invention.

FIG. 23 is a like diagrammatic view of another such guide-and-followerset.

FIG. 24 is a like diagram of still another such guide-and-follower set.

FIGS. 25a and 25b are perspective and elevational views, respectively ofa partial internal ring structure also usable as a guide-and-followerset in some embodiments of the second or third basic form of myinvention.

FIG. 26 is a perspective view of an embodiment of my invention such asmight be used in, for example, either a functional objet d'art or aninexpensive novelty item. Here the outer structures are not toroids orany other kind of regular geometric form, but rather are highlyirregular and fanciful figures.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The basic appearance of certain preferred embodiments of my invention isillustrated in FIGS. 1 through 1c. This embodiment may be simply amechanical joint used for purposes of adjustable positioning, or asexplained below it may be provided with internal elements for flux orforce transmission.

The joint includes two toroids or "doughnut"-shaped parts 21 and 31which interlock. In the illustrations, one toroid 21 is drawn to appearhorizontal, and for definiteness of the following discussions will becalled the "horizontal toroid"; the other toroid 31 will be called the"vertical toroid".

On each toroid is a connection part, 11 and 41 respectively, forattachment of articles to the joint. For clarity in illustrating therelative orientation of the two toroids, the connection parts 11 and 41have been shown as projecting small cylinders. The illustratedconnection elements 11 and 41 are fixed along the outer peripheries ofthe respective toroids 21 and 31, and project radially outward.

As mentioned earlier, however, even the attached articles themselves maybe embedded or surface elements. Hence the connection parts can take agreat variety of different forms, including recesses, tapped or detentedholes, or surface-attachment areas.

As shown in FIG. 2, each toroid 21 or 31 has a respective circularcentral aperture 26 or 36. The body of each toroid is circular incross-section, and preferably for most purposes the figures aresubstantially geometrically regular.

In particular, each toroid body is substantially uniform in size all theway around. Thus in FIG. 2 the diameter D of the body of the horizontaltoroid 21 as seen (in cross-section) at the far right side of thedrawing is equal to the diameter B of the body of the same toroid 21 asseen (likewise in cross-section) nearer to the left side of the drawing.

Similarly the diameter A of the body of the vertical toroid 31 as seen(in elevation) at the far left side of FIG. 2 is equal to the diameter Cof the body of the same toroid 31 (likewise in elevation) nearer to theright side of the drawing.

For most purposes the body of each toroid is preferably sized to justfit through the central aperture of the other--and allow relative motionwith some desired amount of freedom. As a practical matter the relativesizes may vary from a press fit to a substantial clearance.

The precise size relationships chosen will vary with the frictionalcharacteristics of the two surfaces involved (which may vary fromTeflon® through Velcro®), the resiliencies of the two toroidal bodies,the weights and orientations of article(s) to be suspended, whetherstabilization is otherwise provided, and generally the purpose orapplication of the joint.

In other words, the minor diameter of each toroid is very nearly thesame size as the diameter of the central aperture of the other toroid.By "minor diameter" I mean the diameter as measured across the smalldimension of the body.

The toroids 21 and 31 shown in FIGS. 1 through 2 are substantially thesame size--both in major and minor dimensions. Thus in FIG. 2 the minordiameter A or C or the vertical toroid 31 is equal to the minor diameterB or D of the horizontal toroid 21.

Accordingly, for the toroids in FIGS. 1 through 2, the major diametersare also equal. That is, the major diameter A+B+C of the vertical toroid31 is equal to the major diameter B+C+D of the horizontal toroid 21.

As demonstrated in FIG. 3, however, my invention can be made and usedwithout observing these equalities. The horizontal toroid 121 of FIG. 3has a much smaller minor diameter than the vertical toroid 131.

Nevertheless, as in the equal-toroid case for the first form of myinvention, the central aperture of each toroid must approximately matchthe minor diameter of the other. Consequently, for the vertical toroid131, the central-aperture diameter is much smaller than the minordiameter; but the opposite is true of the horizontal toroid 121.

In any of these constructions, each toroid can shift relative to theother, in two different kinds of motion. First, as suggested by thedouble-headed vertical arrow 51 (FIG. 1), the horizontal toroid 21 canrotate vertically about the major axis of the other toroid--the verticaltoroid 31.

(By the major axis I mean the straight line 38 that passes through thecenter of the aperture--the "doughnut hole"--in the vertical toroid 31,at right angles to the central plane of that toroid. Tangent to thismajor axis of the vertical toroid 31 is the minor axis of the horizontaltoroid 21, which is the circular centerline of the endless body thatconstitutes the toroid 21. Regardless of orientation of the two toroids,the major axis of each is always tangent to the minor axis of the other,at some point along that minor axis.)

When so rotated about the major axis of the vertical toroid 31, thehorizontal toroid 21 is also rotating about its own minor axis, at thepoint of tangency between those two axes. It seems natural to think ofthe horizontal toroid 21 in this mode of rotation as traveling along thebody or the arch of the vertical toroid 31.

As stated above, however, a second kind of motion is also available. Assuggested by the rotation of the double-headed horizontal arrow 52, thehorizontal toroid 21 can rotate about its own major axis 28 (FIG. 1a).That axis is tangent to the minor axis 37 of the vertical toroid 31,also at the point of rotation. It seems natural to think of thehorizontal toroid 21 in this mode of rotation as circling around thebody of the vertical toroid 31.

The reason for describing these geometrical relationships in such detailis to show that the two axes of rotation available for the horizontaltoroid 21 are mutually offset. The distance between them is equal to theradius of the circular minor axis of the toroid that is being consideredstationary for purposes of this discussion --that is, the verticaltoroid 31.

From these observations it will be understood that this joint providesas many degrees of freedom as a ball joint or a universal joint. Thekind of motion provided, however, is unlike the relative motionsavailable with prior joints.

More specifically, a ball joint generally speaking provides rotationabout the center of the entire joint system. A universal joint may bedesigned to provide rotations in orthogonal directions about mutuallyoffset axes, but the usual design effort is to avoid such an offset sothat the U-joint behaves as much as possible like a ball joint.

My interlocked-toroid joint intrinsically provides rotation about offsetorthogonal axes. Neither axis is at the center of the jointsystem--which will be found at a common surface point along the innerperipheries of the central apertures of the two toroids.

It will be understood that if the horizontal toroid 21 is rotated aboutits own minor axis, in either direction indicated by the vertical arrow51, this toroid 21 will no longer be horizontal. It will still, however,be capable of rotation about the minor axis of the other toroid, ineither direction indicated by the horizontal arrow 52.

In general, the only limitation on angular range of action for eachtoroid is imposed by impingement of the connection element of eachtoroid upon the exterior surface of the other toroid. (Thisconsideration is in fact a limiting one only if the connection elements11, 41 do in fact project from the toroid surfaces 21, 31. As earlierpointed out, my invention can be effectively constructed and used inother forms.)

For example, as shown in FIG. 4, the connection element 41 of thevertical toroid 31 can be rotated counterclockwise (as drawn) to itsindicated position hard against the lower surface of the horizontaltoroid 21. This condition represents one end of the range of motion forthat toroid 31. The same connection element 41 can also be rotatedclockwise against the upper surface of the horizontal toroid 21, to itsposition indicated at 41', to establish the other end of the range ofmotion.

The range of angular motion for each toroid relative to the otherapproaches roughly 331° for negligibly slender connection rods 11, 41;or roughly 317° for connection rods about half the minor diameter of thetoroids. Those skilled in the art of mechanical devices will appreciatethat this is far larger than available with a practical ball joint.

Excepting extreme positions such as shown in FIG. 4, when either toroidis held fixed the other can be moved to nearly any orientation. Forexample, if as shown in FIG. 5 the connection element 41 of the verticaltoroid 31 is fixed--as to a wall or floor 61--the connection element 11of the horizontal toroid 21 can be moved through compound arcuatetrajectories to point in almost any direction. The relative orientationof the two toroids in FIG. 5 is intended to represent such substantiallyarbitrary positioning.

With the toroids so oriented, the connection element 11 can in generalthen be repositioned in virtually any direction, as suggested by thearrows 55 of FIG. 5. The joint thus provides great freedom of angularorientation.

If the connection element 11 of the horizontal toroid 21 is held fixed,conversely, the connection element of the vertical toroid 31 can bepointed in nearly any direction. Such reorientation is possible usingthe same two kinds of rotation as already described for the horizontaltoroid 21.

That is, the vertical toroid 31 is free to rotate vertically orhorizontally, or both. Vertical rotation about its own horizontal majoraxis 38 (FIG. 1c), as shown by the two-headed arrow 54 (FIG. 1), carriesthe connection element 41 to other vertical positions 41'. Horizontalrotation about its own circular minor axis 37 is shown by the two-headedarrow 53.

As a matter of abstract geometry, rotating either toroid about its ownmajor axis is equivalent to rotating the other toroid about its ownminor axis. Hence in pure principle there are not four but only twokinds of motion. In practice, however, the implications of these twomotions may be vary greatly, depending on which (if either) side of thejoint is held fixed and which is movable on the other.

In addition it is possible to leave one or both of the connectionelements 11 and 41 free to rotate about their own axes, at their pointsof attachment with the respective toroids 21 and 31--or at their pointsof attachment with articles which they secure to the toroids. Additionaldegrees of freedom of the joint can thereby be provided, in applicationsfor which such additional mobility is appropriate.

If desired the joint may be provided with stabilization devices such aset-screw 271 (FIG. 6) that passes through a threaded hole 272 in onetoroid 221 and into or against the other toroid 231. If preferred forgreater force and reliability in stabilization, a second set-screw 273can be similarly mounted in the other toroid 231 for action against thefirst toroid 221.

Other types of stabilization devices may be used instead. Alternatively,the sizes and surface properties of the toroids can be designed toprovide adequate stabilization for many intended uses without set-screwsor other accessory stabilizers.

The mechanical joint thus provided is useful in a great many practicalapplications. FIG. 7 shows two interlocked toroids 1121 and 1131 used tosupport a camera 1191 or the like. A connection element 1111 links onetoroid 1121 to a tripod head 1118 or the like, and another connectionelement 1141 links the other toroid 1131 to the camera 1191.

Additional capabilities can be provided the interlocked-toroid system byinner rings or other inner guide-and-follower structures as shown inFIGS. 8 through 25b. If desired, such inner structures may also, orinstead, be used to remove some of the mechanical limitations on therelatively simple system described so far.

For example, with inner structures it becomes possible to eliminate therequirement that the minor cross-section of each toroid make a fairlyclose fit through the central aperture of the other toroid. Very largeclearances may be employed, so that one toroid appears suspended withinthe other.

It is also possible to depart from uniformity of dimensions of the outerstructures, and even from the condition that they be toroids generally.Virtually arbitrary outer shapes may be employed, within the scope ofcertain of my appended claims.

Probably the most interesting change introduced by such innerstructures, however, is the addition of ability to transmit forces orfluxes. Such transmission can be from an article connected to one toroidto an article connected to the other, through both toroids--or ifdesired for particular applications can be only through part of thisseries of objects.

If desired, such transmission can be provided in addition to the use ofvery large clearances between the toroids, and in addition to the use ofarbitrary shapes. If preferred, however, force or flux transmission canbe provided using the geometry already introduced in connection withFIGS. 1 through 7.

FIGS. 8 through 13 illustrate toroidal outer structures 421 and 431fitted with respective joined-ring inner structures 481 and 491. Theseparticular inner rings 481, 491 are adapted to conduct electrical fluxesor currents on two generally parallel conductors, to provide a complete"round trip" electrical circuit.

The rings 481 and 482, like the toroids 421 and 431, are interlocked.Unlike the toroids, however, the rings 481 and 491 are also firmly fixedto one another, forming a permanent one-piece, solid inner structure.

The rings are joined at a common area 489 along the inner peripheries ofboth rings. As shown, they are at right angles: this condition isnecessary if the toroids 421, 431 fit closely together, but is optionalif there is to be considerable clearance between the toroids.

A groove 432 (FIG. 10) is formed along the inner periphery 436 of onetoroid 431; and preferably a like groove (not illustrated) is providedin the other toroid 441. The rings 481, 491 fit within these grooves, sothat the inside surfaces of the grooves ride on the internal rings.

For closely fitted toroids, when all the pieces are assembled in thisway the rings are substantially concealed deep within the centralapertures of the toroids, so that a casual observer will be unaware thatthere is any inner structure. Even for toroids that have considerableclearance, the rings and grooves can be made very inconspicuous.

The inner rings 481, 491 here shown are of plastic, ceramic or otherinsulating material. They are provided, however, with respective annularmetal or other conductive surfaces 482, 492. These annular conductorsare disposed along pathways defined along or near the peripheries of therings 481, 491.

The conductors 482 on one ring 481 are interconnected with theconductors 492 on the other ring 491, by bridging conductors 499. Thebridging conductors pass through or immediately adjacent to the commonjoinder area 489.

The previously mentioned groove 432 in one toroid 431 is also fittedinternally with electrical brushes 443 (FIG. 12), disposed to engage andmake electrical contact with the conductive surfaces 492 on the ring491. These brushes 443 are connected by wires or other suitableelectrical conductors 444 that pass through the body of the toroid 431.

The latter conductors 444 are continuous with like conductors 442 thatpass through the connecting element 441 and to an article that isattached to that connecting element. That article typically will provideeither a source of electrical power or signals, or a device that usessuch power or signals, or both.

Similarly the unillustrated inner groove in the other toroid 421 alsohas electrical brushes 413 (FIGS. 12 and, showing greater detail, FIG.13) to engage and make contact with the conductors 482 on thecorresponding ring 481. These latter brushes 413 are connected by wires414 or the like through the body of the toroid 421, to wiring 412 in thecorresponding connecting means 411--and thence to an article attached tothat connector.

The article just mentioned will typically provide a usage or source ofelectricity that complements the source or usage provided by thefirst-mentioned article on the other side of the joint. For instance, ifthe joint is used in a table lamp as in FIG. 14, the connecting element1211 of one toroid 1221 receives electrical power from the lamp base1261 and arm 1218.

The connecting element 1241 of the other toroid 1231 passes the power onto the socket and bulb in the lamp head 1291, through an extension arm1248. The base 1261, of course, must be suitably wired to an electricalsource.

Another type of lamp is shown in FIG. 15. In this example one toroid1321 draws power through its connection means 1311 from a wall bracket1318, which is fixed to a wall 1361. The lamp head 1391 receives thispower from the first toroid 1321 through the second toroid 1331, and theconnection means (not shown) on that second toroid.

Again, the bracket 1318 is wired to a power source (not shown) withinthe wall 1361. This view may also be taken as an illustration of tracklighting, with substitution of a sliding bracket at 1318 and matingtrack at 1361.

As can be seen in FIGS. 8 through 10, and FIGS. 12 and 13, the rings481, 491 in effect complete the inner peripheral shapes of the toroids421, 431 respectively. The rings might be regarded as sealing theinternal cavities formed by the grooves. In fact it is not necessary toprovide actual fluid-tight seals, since in the applications illustratedin these figures there is normally nothing to escape from or into theinterior cavities.

Nevertheless these interior tunnels do suggest a potential for conveyingother kinds of flux--in particular, fluxes of liquid or gas--along thecircumferential paths formed within the toroids.

In fact fluid fluxes can be transmitted along such paths, and in and outof the toroids through the external connectors and the bridging pointswhere the toroids are joined. A geometry particularly adapted for suchapplications appears in FIGS. 16 through 18.

Here each inner ring is made in the form of a half-tube 581 or 591. Eachinner ring defines the inner half of a hollow toroidal tube, sealed to arespective outer half-tube 521 or 531.

The seals are made so that each outer half-tube can slide along theoutward-facing rims or edges of the mating inner half-tube. They do sowhile maintaining the fluid-tight integrity of the inner cavities 582and 592 formed between the respective pairs of half-tubes.

As in the versions of my invention illustrated earlier, the two innerhalf-tubes are joined at their common area 589--along the innerperipheries of both central apertures. A fluid-conveying hole 599 isdefined at this junction area 589, providing fluid communication betweenthe interior cavities of the two toroids.

The connection elements 511 and 541 are also made hollow, and incommunication with the respective toroidal cavities 582 and 592. Hencefluid communication is established from one connection element 511,through the two toroidal cavities 582 and 592 and the interconnectinghole 599, to the other connection element 541--all as diagrammed in FIG.17.

If necessary or desired to minimize leakage, the walls of the half-tubescan be made thicker as suggested in FIG. 18, and can be configured--asthere illustrated at 622--to provide a longer pathlength for leakage.Alternatively, or in addition, the joint may be provided with separateelastomeric seals (not shown) or the like.

One simple application of these fluid-transmitting joints appears inFIG. 19. One toroid 1421 receives water through an input connectionelement 1411, from suitable piping within a wall 1461. Another toroid1431 receives the same water from the first toroid 1421, in the mannerillustrated in FIGS. 16 through 18, and passes the water on through anoutlet connection element 1442 to a dispensing element such as a showerhead 1491.

Through study of the drawings discussed so far it can be verified thatnothing prevents superimposing the electrically conductive features ofFIGS. 8 through 13 upon the fluid-conducting structures of FIGS. 16through 18. Similarly it is possible to provide dual or even triplediscrete fluid conduits within the joint, by segmenting the toroidalcavities longitudinally and providing separate intertoroidalfluid-communicating holes for the discrete dual or triple conduits.

Therefore both plural electrical circuits and plural fluids can beconveyed through a single joint as required for various applications.Again, this can be accomplished while preserving the mechanical mobilityof the joint substantially as described above in connection with FIGS. 1through 7.

Mechanical forces can also be transmitted through the novel joint of myinvention. As mentioned earlier, the concept of force transmissionthrough a joint has two senses or meanings.

First, suppose that the connection elements 11 and 41 of FIG. 1 arefirmly fixed to their respective toroids 21 and 31. Suppose also thatthe toroids are oriented so that the connection elements are at leastclose to mutual alignment--as they are drawn in FIG. 1. Then, as will beclear from that illustration, rotating either connection element 11 or41 about its own axis will result in similarly rotating the otherconnection element 11 or 41.

Another kind of mechanical force transmission through the joint,however, is more difficult to accomplish and correspondingly moreinteresting. In this second type of force transmission, the joint is anactive element in reorienting itself.

In all of the uses discussed above, the joint is merely passive. Forcesare applied externally--e.g., manually--to reorient articles at the twosides of the joint.

In all those previously discussed applications, the joint itself does nomore than (1) permit motion in response to such forces, to place thearticles in desired orientations and positions; and (2) frictionallyhold the articles in approximately the positions and orientations inwhich they were placed. Now I wish to show that the joint can be madeself-adjusting.

FIG. 20 illustrates a version of my invention that provides thatcapability. Once again the toroids 721 and 731 are provided, around theperipheries of their central apertures, with internal grooves; andinternal rings 781 and 791 respectively are fitted within these grooves.

Once again the internal rings 781 and 791 are mutually interlocked, andare mutually fixed at a common area 788 along the inner peripheries ofboth rings. Now, however, instead of electricity- or fluid-conductingsurfaces the rings 781 and 791 are provided with force-transmittingsurfaces 782 and 792 respectively.

The force-transmitting surfaces 782 and 792 are thus defined along verygenerally circular paths within the respective toroids. Disposed inrespective engagement with these surfaces 782 and 792 are matingforce-transmitting elements 713 and 743.

These elements 713 and 743 are mounted for rotation in the respectivetoroidal bodies 721 and 731. Although the force-transmitting elements713 and 743 are free to rotate about their own axes, those axes arefixed in position along the endless toroidal bodies 721, 731.

The force-transmitting elements 713 and 743 are so shaped, and areengaged with the force-transmitting surfaces 782 and 792 in such a way,that when the elements 713 and 743 rotate they force theforce-transmitting surfaces 782 and 792 to move relative to therotational-axis locations. In other words, the force-transmittingsurfaces 782 and 792 are forced to move within the grooves in thetoroidal bodies 721 and 731.

Such motion of the surfaces 782 and 792 of course requires motion of theinner rings 781 and 791 along which the force-transmitting surfaces aredefined. Consequently the inner rings 781 and 791 rotate relative to thetoroids 721, and 731.

Connection elements 711 and 741 are provided on the toroids 721 and 731,at the fixed positions desired for the rotational axes of theforce-transmitting elements 713 and 743. Motor casings 756 and 757 arefixed to the connection points 711, 741, and the driveshafts 712 and 742of the motors are journalled through the bodies of the toroids 721 and731.

The ends of these driveshafts remote from their motors are fixed to theforce-transmitting elements 713 and 743 in such a way that operation ofthe motors rotates the force-transmitting elements, resulting aspreviously mentioned in motion of the inner rings 781 and 791 relativeto the toroidal bodies 721 and 731 respectively.

For greatest strength and transmission of relatively large forces, theforce-transmitting surfaces 782 and 792 may be annular gear teethdefined in the rings 781 and 791. The force-transmitting elements 713and 743, naturally, are then pinion gears adapted to drive the gearteeth 782 and 792.

Various sorts of gears may be employed, including the bevel ring gears782, 792 and matching conical pinions 713, 743 illustrated in FIG. 20.Straight and even helical drive gears may be substituted for variouspurposes, with appropriate reconfiguration of the ring gears.

The selection of particular gearing forms should be appropriate to thedifferent force levels, speeds, and other details of each application athand. Suitable selection and design criteria for such gearing will beclear to those skilled in the art of mechanical design.

As will also be clear to such skilled artisans, it is not necessary touse gears at all. Rather, for some applications, a traction surface maybe substituted for either or both of the gear sets 782 and 792; andmating drive wheels may be substituted for either or both of the pinions713 and 743.

Suitable materials for both the traction surface at 782 or 792 and thedrive wheels at 713 or 743 may include elastomers with various degreesof resiliency and tack. Generally smoother operation and fineradjustment increments will be available with such systems, though forrelatively lower levels of transmitted force.

The motors 756 and 757 may be entirely concealed within the connectionpoints 711, 741 or even within the toroidal bodies 721, 731; or they maybe in plain view. The motors may share the connection points 711, 741with articles to be connected to the joint for mutual motion; orseparate connection means for such articles may be provided along theperipheries of the toroids.

Furthermore, the motors may be electrical, air, or liquid motors. Theirelectrical, air or liquid drive power may be supplied through separateconductive wiring or tubing; or through the joint itself.

Here again, study of the drawings discussed so far will reveal that theinclusion of electrical or fluid circuits within the joint is entirelycompatible with the provision of tractive surfaces and elements per FIG.20. Consequently power or fluids, or both, to manipulate the jointitself may be supplied through the joint as well as power or fluids, orboth, for other purposes.

FIG. 20 may also be taken as representing a joystick device in which thejoint is manipulated manually. In such a device the elements 756 and 757are not motors, but instead are electrical-signal or fluid-motiongenerators responsive to the motion of the joint.

Not only conventional electrical generators or alternators, but alsomodern electromechanical sensors (such as finely graduatedradial-contact arrays) or electromagnetic angular-motion sensors orcounters may be employed for optimum economy, and/or compatibility withmodern digital-logic utilization circuits.

In some applications it may be desired to minimize operating friction ofthe joint. As shown in FIG. 21 an internal race 882, 892 may be providedwithin each toroid 821, 831; and balls or rollers 862, 863 may bedisposed within the races 882, 892.

Such balls or rollers can be designed to suspend and carry the inner andouter parts 821/881, 831/891 of the toroids relative to one another in arolling-friction mode. Such provision may be made in combination withflux or force transmission features already disclosed.

Conventional bearing styles may be substituted in one or both toroids.If bearings are desired in both halves of the joint, however, at leastone must be assembled from two parts since the bearings must interlock.

As previously mentioned, for many applications of my invention it is notnecessary to use complete rings or to form closely fitting grooveswithin the toroids. Alternative guide-and-follower sets are suggested inFIGS. 22 through 24.

FIG. 22 shows a partial ring 991, fitted with a pair of sleeves 933a,933b that ride along the partial ring at a fixed distance defined by across-member 934 within the ring. Bosses 996a, 996b at the ends of thering 991 limit the travel of the sleeves 933a, 933b respectively.

Clearance spaces 932a, 932b between the sleeves 933a, 933b and the ring991 may be lubricated or provided with bearings, or both. On the otherhand the surfaces exposed in these spaces may have miniature detents orgripping elements to increase friction.

FIG. 23 shows a variant of the FIG. 23 system, in which the cross-member934' is outside rather than inside the partial ring 991'. The sameconsiderations as to surface characteristics apply here.

In either of FIGS. 23 or 24, the partial ring 991, 991' may beassociated with and fixed to the outer structure such as toroid 421, 431(FIGS. 8 through 13); while the follower assembly composed of sleeves933a/933b, 933a'/933b' and crossbar 934, 934' may serve in lieu of theinner structure such as inner ring 481, 482. With equal effectiveness,however, the associations can be reversed.

FIG. 24 shows another kind of inner structure 1091a-b that can besubstituted for either inner ring previously discussed. The innerstructure shown here is simply two mutually angled bars 1091a and 1091b,strongly secured together at a fixed angle to form a corner.

Both ends of the inner structure 1091a-b of FIG. 24, and the corner aswell, are formed to match, e.g., the peripheral surface of an interiorgroove 1032 formed along the periphery 1033 of the central aperture in atoroid 1031. Suitable interfaces 1034a, 1034b and 1034c are thusprovided for relative motion of the inner structure 1091a-b and theouter toroidal body 1031.

Also shown in FIG. 24, in cross-section, is the corresponding innerfollower member 1081 associated with another toroid (not illustrated).The two follower components 1081 and 1091b are secured together at acommon area 1089 very generally coincident with the inner peripheries ofthe two toroids.

Flux or force transmission is thereby provided between the two innerfollowers 1081, 1091b--and thereby across the joint. These elements1081, 1091b thus can provide all or any of the various intertoroidsuspension and transmission functions previously described.

As shown in FIGS. 25a and 25b, relatively short partial-ring sections981", 991" may be used within interlocked toroidal outer bodies toachieve some of the same functions. These structures are joined at acommon area 989" along both inner peripheries, and may transmit force orflux between the halves of the joint as before, though of course over anarrower operating angular range.

FIG. 26 demonstrates that my invention, in its forms that include innerguide-and-follower structures of the types disclosed above, may be usedwith generally arch-shaped figures of arbitrary exterior form.

Construction techniques for various embodiments, forms and variants ofmy invention are shown in the remaining drawings, which are selfexplanatory. All the dimensions of various versions of my invention canvary widely, from miniatures with minor diameters and central aperturesof a small fraction of an inch to massive structures many feet across.

It will be understood that the foregoing disclosure is intended to bemerely exemplary, and not to limit the scope of the invention--which isto be determined by reference to the appended claims.

I claim:
 1. In combination, a connective joint incorporated integrallyin a lamp, said joint providing a rotational component of relativemotion of a lamp base in relation to a lightbulb fixture, about an axishaving any arbitrarily selectable orientation; said combinationcomprising:a substantially stationary article; an article that issubstantially unrestrained, except by said joint, and that is in theform of a lightbulb fixture; wherein the substantially stationaryarticle is in the form of a lamp support; and a connective jointcomprising:two interlocking toroids, each having a substantiallycircular minor cross-section and each having a substantially circularcentral aperture, the minor cross-section of each toroid being sized tosubstantially just fit through the central aperture of the other toroid,first connection means on one of the toroids for securing that toroid tothe lamp support, and second connection means on the other of thetoroids for securing that toroid to the lightbulb fixture.
 2. Thecombination of claim 1, wherein:the lamp support is selected from thegroup consisting of a lamp base, a lamp wall bracket, and a lightingtrack.
 3. The combination of claim 1, wherein:the lamp support is aportable lamp pedestal.
 4. In combination, a connective jointincorporated integrally in a lamp and providing a rotational componentof relative motion of a lightbulb fixture in relation to a lamp base,about an axis having an arbitrarily selectable orientation, and for usein transmitting a flux of electricity between the lamp base and thelightbulb fixture; said joint comprising:a lamp support; a lightbulbfixture; and a connective joint comprising:two interlocking toroids,each having a substantially circular minor cross-section and asubstantially circular central aperture, the minor cross-section of eachtoroid being small enough to fit through the central aperture of theother toroid; and the central aperture of at least a particular one ofthe toroids having an inner periphery, flux-conducting means, formedalong a path from within said particular one of the bodies, andpenetrating through said inner periphery of said particular one of thebodies, to the other body, and connection means on each toroid forsecuring that toroid to one of such two articles respectively; whereinsaid flux-conducting means carry electricity from the pedestal to thelightbulb.
 5. The combination of claim 4, wherein:the lamp support isselected from the group consisting of a lamp base, a lamp wall bracket,and a lighting track.
 6. The combination of claim 4, wherein:the lampsupport is a portable lamp pedestal.
 7. The combination of claim 4,further comprising:an annular groove defined along the inner peripheryof the central aperture in said particular toroid; and an inner ringmovably disposed within the groove; and wherein a portion of said paththat is within said particular one of the toroids is generally circularand is associated with the inner ring and its corresponding groovewithin the particular toroid; and said electricity-conducting meanscomprise:intratoroid flux-conducting means, formed along said path, forconducting such flux along the path, and intertoroid flux-conductionmeans for conducting such flux from the path to the other toroid.
 8. Alamp comprising:a lamp support; a lightbulb fixture; and interconnectingthe fixture and the support, a connective joint comprising:twointerlocked bodies, each body being at least very generally arched, andeach body substantially surrounding an aperture which is at least verygenerally central to the body, means, interconnecting the bodies, forconstraining the bodies to mutually arcuate motions, each body beingsmall enough to fit through the central aperture of the other body, inat least part of said motions of the bodies, connection means on one ofthe bodies for securing that body to the lamp support, and connectionmeans on the other of the bodies for securing that body to the lightbulbfixture.
 9. The lamp of claim 8, further comprising:means for conductingelectricity from a source of electricity to the lightbulb fixture. 10.The combination of claim 9, wherein:the electricity-conducting meanscomprise means for conducting electricity through the connective joint.11. The lamp of claim 8, further comprising:a lamp shade secured to thefixture.
 12. The lamp of claim 11, further comprising:means forconducting electricity from a source of electricity to the lightbulbfixture.
 13. The combination of claim 12, wherein:theelectricity-conducting means comprise means for conducting electricitythrough the connective joint.
 14. The lamp of claim 8, wherein:each ofthe bodies is substantially a toroid; and each of the bodies has asubstantially circular minor cross-section and a substantially circularcentral aperture.
 15. The lamp of claim 14, further comprising:means forconducting electricity from a source of electricity to the lightbulbfixture.
 16. The lamp of claim 14, further comprising:a lamp shadesecured to the fixture.
 17. The lamp of claim 16, furthercomprising:means for conducting electricity from a source of electricityto the lightbulb fixture.
 18. The lamp of claim 14, wherein:the minorcross-section of each toroid is sized to substantially just fit throughthe central aperture of the other toroid.
 19. The lamp of claim 18,further comprising:means for conducting electricity from a source ofelectricity to the lightbulb fixture.
 20. The lamp of claim 18, furthercomprising:a lamp shade secured to the fixture.
 21. The lamp of claim20, further comprising:means for conducting electricity from a source ofelectricity to the lightbulb fixture.
 22. The combination of claim8:wherein the central aperture of at least a particular one of thebodies has an inner periphery; and further comprising: electricalconduction means for conducting electricity along a path from withinsaid particular one of the bodies, and penetrating through said innerperiphery of said particular one of the bodies, to the other body;wherein said conduction means carry electricity from the lamp support tothe lightbulb fixture.
 23. The lamp of claim 8:wherein the centralaperture of at least a particular one of the bodies has an innerperiphery; and further comprising: an annular groove defined along theinner periphery of the central aperture in said particular body; aninner ring movably disposed within the groove; first conduction means,formed along a generally circular path associated with the inner ringand its corresponding groove within the particular body, for conductingelectricity along the path; and second conduction means for conductingelectricity from the path to the other body; wherein said first andsecond conduction means carry electricity from the lamp support to thelightbulb fixture.
 24. The lamp of claim 23, further comprising:a lampshade secured to the fixture.
 25. The lamp of claim 23, wherein:theminor cross-section of each toroid is sized to substantially just fitthrough the central aperture of the other toroid.
 26. The combination ofclaim 8, wherein:the lamp support is selected from the group consistingof a lamp base, a lamp wall bracket, and a lighting track.
 27. Thecombination of claim 8, wherein:the lamp support is a portable lamppedestal.